Okay this is what Illia says about the color:
Nope, he's a melanized Gold Duckwing carrying the Columbian gene, which reverses his colors, thus, he only appears to be carrying dominant white. He'll make some fine Sex-Links for ya.
Illia you sound like a politician! Sorry couldn't help myself, actually Illia is awesome about anything genetics and color, she is a wealth of info.